Process of recovering naphthalene from gas.



RICHARD H. BOTS, OF SYRACUSE, NEW YORK.

PROCESS OF RECOVERING NAPHTHALENE FROM GAS.

Specification of Letters Patent.

Application filed August 17. 1908, Serial No. 448,903.

No Drawing.

Renewed September 8, 1909. Serial To all whom it may concern:

Be it. known that I. lticnaun IT. Bo'rs a subject of the King of Belgium, and resident of Syracuse, iu the county of ()noudaga, in the State of New York, have invented new and useful improvements in Processes of Recovering Naphthalene from Gas, of which the following is a full, clear, and exact description.

This invention is designed to effect the recovery of naphthalene in a practically pure state from gas in an expeditious and inexpensive manner. To obtain this result, 1 subject the gas to the action of an aqueous solution (preferably a saturated aqueous solution) of picric acid by the employment of any apparatus generally used for washing or scrubbing gas. The absorbing action of the introduced acid causes the naphthalene, which is prescmi, to combine with the acid thereby producing the compound termed naphthalene pier-ate whose formula is commonly given as:

one of the fol-lowing treatments may be used W hen dried even at a temperatu as low as i30 (3., the naphthalene Wlll sublime and leave the picric acid. When treated with ammonia, the decomposition results in ammonium pierate and free naphthalene.

The best and most practical treatment of said compound consists in subjecting the same to steam distillation, in which case the steam carries over with it the napthalene and leaves the pi cric acid. superheated steam is preferred in this latter treatment because it avoids undue dilution of the picric acid solution. Y

t The described process of recovering naphthalene from gas is very economical from the fact that the picric acid is allowed to be repeatedly introduced into the gas, which is a most important feature of my invention. This process obviates the liability of gasconveying pipes becoming clogged, it being well known that the presence of naph thalene greatly impairs the flow of gas. 11 urthermore it prevents contamination of the absorbing oils and hence the tar light oils recovered from the absorl'iing oils.

lVhat I claim as my invention is:

1. The process of recovering naphthalene from gas which consists in subjecting the gas to the action of picric acid whereby the naphthalene is absorbed by said acid, and then treating the resultant compound so as to free the naphthalene in a pure state, and leave the picric acid in its naturalcondition for repeated use.

2. The from gas which consists-in subjecting the gas to theaction of a solution of picric acid, and then separating the naphthalene from the resultant compound napthalene pier-ate by subjecting said compound to steam distillation.

RICHARD H. BOTS. [L. s.]

\Vitnesses J. N. Bono'r, Jr, J. J. LAASS.

Patented Aug. 23, 1910.

process of recovering naphthalene 

